Motorola rolled out its fourth-generation of Moto G devices, and this year we're looking at three new iterations of the G-series smartphone.

Meet the Moto G4 and the Moto G4 Plus, and stand ready for a full spec comparison with the last year's model, the third-gen Moto G. We're leaving out the Moto G Play, as it has less ambitious specifications.

First of all, it should be mentioned that the G4 and the G4 Plus are not that different in size and design. However, when we take a look under their hoods, discrepancies start to pop up.

It comes to no surprise that the G4 Plus is the more gifted of the two devices, with special praise going to the fingerprint sensor and cutting-edge main camera.

If you are not sure whether or not to upgrade your last year's Moto to one of the new releases, we have your back. Take a look below at the comparison between the Moto G4 Plus, the Moto G4 and the Moto G from 2015.

The new devices come with Android 6.0 pre-installed, while the Moto G (2015) had Lollipop when it first arrived. However, the Marshmallow update hit the older device, so all three phones are on par.

The new Moto phones pack 5.5-inch screens capable of displaying 1080p resolutions and are protected by Corning Gorilla Glass 3. The previous model comes with a 5-inch screen and 720p of maximum resolution protected by Corning Gorilla Glass 3.

The two Moto G4 handsets share the CPU, an eight-core Qualcomm Snapdragon 617 that runs at 1.5 Mhz and is backed by 2 GB of LPDDR3 RAM. The Moto G4 Plus also comes in a model with 3 GB of RAM. The Adreno 405 provides visuals for both smartphones from 2016. Meanwhile, the 2015 edition of Moto G has a quad-core Qualcomm Snapdragon 410 that runs at 1.4 Mhz and comes with 2 GB of RAM. The Moto G (2015) uses an Adreno 306 GPU.

The first difference shows in internal storage. The G4 Plus comes with 32 GB of default space, while the G4 and G (2015) both have 16 GB of default memory. The Moto G (2015) also had a variant carrying 8 GB of internal memory.

The 2016 iterations of Motorola sport 3,000 mAh batteries, while the 2015 edition makes do with a 2,470 mAh power source.

Looking at the capabilities of the cameras, the Moto G4 and Moto G4 Plus can record video footage in 4K.

The G4 Plus is best fitted for photography with a 16-megapixel main sensor, while the G4 only has a 13-megapixel rear camera. The 2015 variant of Moto G sports a 13-megapixel main sensor as well. The G4 Plus uses an LED flash, while the other two handsets rely on dual LED. The selfie sensor is a 5-megapixel throughout the phones.

It looks like Lenovo pulled the plug on the picture-taking ability while filming, which was present in the Moto G (2015).

Connectivity wise, all devices feature LTE, HSPA and UMTS.

The Moto G (2015) is better fitted for harsh environments than the new additions, as it's water-resistant and IP7 certified. The new Moto G4 only sports a water-repelling nano-coating.

The color scheme for all three devices is the same, black and white. When looking at the general build, the Moto G (2015) had a main body made of plastic, but the Moto G4 and Moto G4 Plus get some metallic accents to boot.

All in all, the new Moto G4 and G4 Plus bring some notable improvements compared to last year's model. Whether the improvements are enough to warrant an upgrade, it's up to Moto fans.